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HBASE-26071: Document HBASE-26021 and upgrade considerations for 1.7.0/1.7.1 (#3469) 

Signed-off-by: Viraj Jasani <vjasani@apache.org>
Signed-off-by: Reid Chan <reidchan@apache.org>
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Bharath Vissapragada 2021-07-22 19:30:30 -07:00 committed by GitHub
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src/main/asciidoc/_chapters/upgrading.adoc
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@ -128,6 +128,13 @@ Previously, we tried to maintain dependency compatibility for the underly Hadoop
|Operational Compatibility | N |N |Y
|===
[IMPORTANT]
======
HBase 1.7.0 release violated client-server wire compatibility guarantees and was subsequently
withdrawn after the incompatibilities were reported and fixed in 1.7.1. If you are considering an
upgrade to 1.7.x line, see <<upgrade1.7.x>>.
======
[[hbase.client.api.surface]]
==== HBase API Surface
@ -799,6 +806,21 @@ To upgrade an existing HBase 1.x cluster, you should:
* Upgrade RegionServers
* (Eventually) Upgrade Clients
[[upgrade1.7.x]]
=== Upgrading to 1.7.1+
HBase release 1.7.0 introduced an incompatible table metadata serialization format that broke the
minor release compatibility guarantees. The issue was reported in https://issues.apache.org/jira/browse/HBASE-26021[HBASE-26021] and the problematic serialization patch was reverted in
HBase 1.7.1. Some important notes about 1.7.x upgrades below.
* If you are considering an upgrade to 1.7.x version, skip 1.7.0 completely and upgrade to 1.7.1+
version. 1.7.0 was withdrawn and removed from the Apache sites.
* If you already installed a 1.7.0 cluster from scratch and are looking to migrate to 1.7.1+, you
cannot follow the regular rolling upgrade procedures due to broken compatibility contracts.
Instead shutdown the cluster and reboot with 1.7.1+ binaries. Newer versions detect any existing
tables with incompatible serialization and rewrite them using the correct format at bootstrap.
* If you are already on 1.7.1+ version, everything is good and no additional steps need to be
performed.
[[upgrade1.4]]
=== Upgrading from pre-1.4 to 1.4+